The Marquess's Matriarch Becomes a Vicious Mother-in-Law in a Period Novel

【Ancient-to-modern transmigration + devoted couple + personal space + period setting + everyday family life】 A noble family with a century of history, all six generations living under one roof. Yu Qinglan, the matriarch of the Xuanwei Marquis household, didn't live to be a hundred, but she was certainly an old lady of venerable age. As expected, if you're not their own flesh and blood, you don't count as family! She had been virtuous and gracious for sixty whole years, and had raised her husband's descendants all the way to the great-great-grandchildren's generation. Every one of them had always been the picture of filial devotion, but when she was truly dying, there wasn't a single son or daughter by her bedside. Only the maid who tended to her was there! Who knew that when she opened her eyes again, she'd be alive once more! Not only had she transmigrated, she'd transmigrated into a book! What? Eldest son wants to kill his first wife and their quadruplets just so he can marry that shameless woman he can't forget? You wicked brat, dream on! What? Third son wants to sell his eldest daughter for a lavish bride price so he can marry into that vicious supporting character's family? You little bastard, are you asking to die? What? The original heroine keeps going after her blood relatives to avenge all the petty grievances from her past life? What the hell? Let's burn it all down! What, just because I haven't shown my strength, you all think I'm a sick cat? Have you asked about the hundred-jin strength in these hands of mine?! A marquis's wife versus an apocalypse-era powerhouse, together they take on the 1970s and live lives of → truth [wide-eyed]~ kindness [gritting teeth]~ beauty [clenched fist]~